Posters

Clinical evaluation of the ABCD classification to assess keratoconus progression

Poster Details

First Author: I.Bahar ISRAEL

Co Author(s):    R. Yavnieli   U. Elbaz   Y. Nahum   E. Livny   A. Achiron        

Abstract Details

Purpose:

Predicting keratoconus (KC) progression is challenging. Recently, a grading classification – ABCD – which incorporates changes in the posterior surface of the cornea and best corrected visual acuity was proposed to better reflect the ectatic changes in keratoconus. Our aim was to evaluate the ABCD classification by Pentacam, in the detection of keratoconus progression.

Setting:

A tertiary referral hospital, Rabin Medical Center, Ophthalmology Division, Petah Tikva, Israel.

Methods:

A retrospective chart review of all KC patients who underwent cross-linking (CXL) surgery at the Rabin Medical Center between the years 2016 to 2018. We include only patients who had undergone at least 2 corneal tomography prior to the CXL. Preoperative parameters were recorded and agreement between clinical diagnosis of progression and ABCD software recognition of progression was evaluated.

Results:

We evaluated 66 Eyes of 56 KC patients (age 25.8±6.4 years, 70.8% male) over a median of 8.7 months (interquartile range:9.5). The mean Kmax increased by 1.5±5.4D and mean thinnest point decreased by 10.7±25.2µ. Significant change in the ABCD was observed in 87.9% of cases who underwent CXL based on the physician clinical judgement for progression (2 parameters above 80% confidence interval (CI) or 1 parameter above 95% CI). Cases where disagreement arose between the software and the clinical judgement of the physician (12.1%) will be discussed during this presentation.

Conclusions:

A good agreement between clinical judgement of KC progression and ABCD classification system exists. Further studies should be made to evaluate the importance of this system in clinical settings.

Financial Disclosure:

None